Machine for threading pipe



(No Model.)

G. W. BUMGARNER.

MACHINE POR THREADING PIPES.

No. 898,580. *im Pgeed Feb. 26, 1889.

v, J www N. PETERS. Phoxo-Lmmgnphef. wnshnmnn. D.C.

. hereinai'ter described, is removed.

UNiTEn STATES PATENT OEEicE.

GEORGE W. BUMGARNER, OF BALTIMORE, MARYLAND.

MACHINE FOR THREADING PIPE.

SPECFICATION forming part of Lett-Ms Patent No. 398,580, dated February2G, 1889.

Application filed November 19, 1888. Serial No. 291,254. (No model.)

vInthe further description of the said invenl tion which followsreference is made to the accompanying drawings, forming a part hereof,and in which- Figure l is a central longitudinal section of the improvedthread-cutter; a nd Fig. i), a face i View of the lower portion of thesame, looking 1 in the direction indicated by the arrow, Fig. l. Fig. 3is a section ot Fig. l, taken on the dotted line xx. Fig. 4 is asectional view of Fig. l, taken on the dotted line y y. Fig. 5 is asimilar view to Fig. 2, except that a plate, Fig. 6 is a detail ot theinvention, the part represented being shown in section, the line ofwhich is taken through Z Fig. 5.

Similar letters of reference indicatie similar parts in all the iigures.

In the said drawings, A is a sleeve, formed of the two parts u and b-the'former interiorly threaded and the latter threaded on the outside andadapted to lit within the former. The outer end of the section eenlarged, so as to form a polygonal chamber, c, in which is secured thedie CZ for cuttingI the thread. This die, it of the largest sizeintended to be used in the tool, is placed directly in the chamber c;but it it is ot a size smaller a bushing-box, e, is used, and the dieplaced in the box, as shown in the dran-'in in case a still smaller dieis to be used, a box having thicker side walls is substituted for theone shown, so as to further reduce the size of the chamber. It isobvious that if all the dies for cutting screws were of the sameexterior size a bushingbox would not be necessary, or one bushing wouldsuiiice. The die is held in its chamber by means of a plate, B, securedto the face of the sleeve b v the screws f. A portion ot the sleeve isprovided with ratchet-teeth g, which are of the same angle withreference to radial lines on both sides, as shown in Fig. il. Around thesleeve o, and directly over the ratchetteeth g thereon, is looselyplaced a handle, C, the lower en d ot' which is formed of two plates, hand lz'. The plate 7i rests on a collar,j, while the one 1'. [its aroundthe sleeve proper, and the handle is retained in position by means of acollar, 7;, which is fastened to the sleeve through the medium of thescrews I.

D is a pawl having two prongs, in and n, either one ot which is adaptedto engage with the ratchet-teeth g. This pawl is pivoted within thehandle C on a pin, o.

E is a spring formed of a piece ot' \\'ire,which is inserted through thelug p on the upper end of t-he pawl, and twisted so as to form a fork,as shown in Fig. 3.

F is a shaft which passes through the plate h, and is held to the innersurface of the plate t by means ot' a screw, q, as shown in Fig. l. Thisshaft, at a point between the tines of the fork E, is turned to a smallsize, and the pin thus produced is eccentric with reference to theremaining portion, so as to Form n crankpin, fr. (See Figs. l and Theshaft Fis iitted with a handle, G, on the outside of the plate lnwherebythe crank-pin maybe thrown to one side or tothe other, and thereby makeeither ol the prongs of the pawl D t-he active one. This change in theposition ot the pawl is to admit ot' the reversal of the movement ot thesleeve with a common movement of the handle. C. The pins s and t limitthe movement of the handle G in either direction.

At the rear end of the sleeve A, and in the section thereof denoted byZJ, is inserted a centering-ring, H, provided at its bottom with thcinner teeth, u, and at its upper side with a toothed jaw, I, whichenters the said centering-ring through a slot, `r. The movement of thisj aw to clamp the pipe or rod to be threaded is effected by means of thethreaded bar J, which passes through a threaded boss, K, and rests in arecess in the jaw. The portion ot the bar .l in the jaw is reduced insize and grooved, and a pin, 1r, forms the fastening device which holdsthe jaw to the said bar,

and at the same time permits the rotation of thc same independently ofthe jaw.

At the top of the handle C is a socket, in g which a rod, L, is screwedto give the desired leverage.

Then it is desired to thread the end of a pipe or bolt, the two sectionsof the sleeve A l are unscrewed or extended, when the device is placedon thc pipe and clamped thereon by means of the jaw, as beforedescribed,with its ends in contact. with the inner face of the die. lThe pawl is then placed in the position shown in Fig. 3 and the handlevibrated. In this movement the die is forced on the pipe or j bolt andthe thread cut. The object of the screw-connection between the twosections of l the sleeve is to enforce the passage of the die over thepipe, and after that is accomplished ,l to relieve the die of a portionof its work. r Then a thread is cut a suiicient distance on a pipe, thehandle G is reversed in position, which has the effect of changing theposition of. l

the pawl and bringing the prong yn in contact with the ratchet-teethinstead of the one m. The vibration of the handle L is then resumed gand the die unscrewed from the pipe. l I claim as my inventionl l. In ascrew-threadecutting tool,the sleeve A, formed of the outer and innerthreaded l sections,cll and l), the former having a polygo` nal chamber,c, at its end adapted to hold a die and ratchet-teeth on itscircumference, and the latter provided with the centeringring Il, havinginner teeth, and the movable toothed jaw l, with athreaded bar to adjust it within the said ring, combined with a handle, C, formed of theplates 7i an d double pawl forked spring E, and sh aft F, having theeranlpin r situated between the tines of the said forked spring,substantially as and for the purpose specified.

2. In combination with the sleeve-section a, having the circumferentialteeth g, the handle C, having the double pawl D, forked spring E, shaftF, with the crank-pin yr situated between thc tines of the said forkedspring, and handle G,whereby the said crank-pin is moved and theposition of the pawl changed, substantially as and for the purposespecified.

3. As means for holding a pipe within the section b of the sleeve A, thein teriorly-toothed ring H, movable toothed jaw I, and the threaded barJ, all combined substantially asv and for the purpose specified.

GEORGE NV. BUM'GARNER. lllitnesses:

WM. T. HOWARD, DANL. FISHER.

